我使用ValidationSummary服务器控件来弹出错误，但它无法正常工作

问题描述

<div>

<asp:ValidationSummary ID="ValidationSummary2" runat="server" ShowMessageBox="true" ShowSummary="False" HeaderText="Summary" EnableClientScript="True" />
                      <table id="tbl1" runat="server">
                            <tr>
                                <td>class
                                    <br />



                                    <asp:Label runat="server" ID="lbl1"></asp:Label>
                                    <asp:DropDownList runat="server" ID="ddlClass" Width="300px" />
                                    <asp:RequiredFieldValidator ID="rfvClass" runat="server" ControlToValidate="ddlClass" Display="None" ErrorMessage="select class" InitialValue="0"></asp:RequiredFieldValidator>


                                </td>


                                <td>abc<br />
                                    <asp:Label runat="server" ID="lblabc"></asp:Label>
                                    <asp:TextBox runat="server" ID="txtabc" Rows="3" TextMode="MultiLine" Width="450"></asp:TextBox>
                                    <asp:Label runat="server" Text="*" ForeColor="Red"></asp:Label>
                                     <asp:RequiredFieldValidator ID="rfvscope" ControlToValidate="txtabc" Display="None" ErrorMessage="enter the values" runat="server" ></asp:RequiredFieldValidator>

                                </td>


                            </tr>

                           </table>
</div>

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